Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how


The atom and its particles

Atomic number Number of protons in the nucleus
Mass number Number of protons plus neutrons in the nucleus
Atom The smallest particle of a chemical element that can exist
Proton A stable subatomic particle with a positive electric charge equal in magnitude to that of an electron
Neutron A subatomic particle of about the same mass as a proton but without an electric charge
Nucleus The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass
Subatomic particles Particles that are smaller than the atom. The three main subatomic particles that form an atom are protons, neutrons, and electrons
Electron shell A grouping of electrons surrounding the nucleus of an atom
Isotope Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
Ion An electrically charged atom or group of atoms formed by the loss or gain of one or more electrons
Created by: Evafq